Bug #81215 [NEW]: Possible memory leak with closure nested \array_filter()

From: Date: Thu, 01 Jul 2021 12:37:33 +0000
Subject: Bug #81215 [NEW]: Possible memory leak with closure nested \array_filter()
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-234727@lists.php.net to get a copy of this message 
From:             berliozdavid at gmail dot com
Operating system: Fedora/Linux
PHP version:      8.0.8
Package:          Performance problem
Bug Type:         Bug
Bug description:Possible memory leak with closure nested \array_filter()

Description:
------------
With PHP80 using \array_filter() in a closure can lead to memory leak.

PHP74 is not affected.

Test script:
---------------
<?php
namespace Somewhere\On\Earth;
class Foo {
    function leaking(array $array) {
        $f = function ($array) {
            return \array_filter($array, fn($item) => !is_null($item));
        };
        for (;;) {
            $clone = (array) $array;
            $res = $f($clone);
            printf("memory: %d\n", \memory_get_usage());
            unset($clone, $res);
        }
    }
    function run() {
        $array = array_combine(range(1, 1000, 2), array_fill(1, 500,
null));
        $array += array_combine(range(2, 1000, 2), array_fill(1, 500,
true));
        $this->leaking($array);
    }
}
(new Foo())->run();

Expected result:
----------------
stable memory value.

Actual result:
--------------
increasing memory value.

-- 
Edit bug report at https://bugs.php.net/bug.php?id=81215&edit=1
-- 
Fix committed:                    https://bugs.php.net/fix.php?id=81215&r=fixed
Fixed in release:                 https://bugs.php.net/fix.php?id=81215&r=alreadyfixed
Need backtrace:                   https://bugs.php.net/fix.php?id=81215&r=needtrace
Need Reproduce Script:            https://bugs.php.net/fix.php?id=81215&r=needscript
Try newer version:                https://bugs.php.net/fix.php?id=81215&r=oldversion
Not developer issue:              https://bugs.php.net/fix.php?id=81215&r=support
Expected behavior:                https://bugs.php.net/fix.php?id=81215&r=notwrong
Not enough info:                  https://bugs.php.net/fix.php?id=81215&r=notenoughinfo
Submitted twice:                  https://bugs.php.net/fix.php?id=81215&r=submittedtwice
register_globals:                 https://bugs.php.net/fix.php?id=81215&r=globals
PHP version support discontinued: https://bugs.php.net/fix.php?id=81215&r=phptooold
Daylight Savings:                 https://bugs.php.net/fix.php?id=81215&r=dst
IIS Stability:                    https://bugs.php.net/fix.php?id=81215&r=isapi
Install GNU Sed:                  https://bugs.php.net/fix.php?id=81215&r=gnused
Floating point limitations:       https://bugs.php.net/fix.php?id=81215&r=float
No Zend Extensions:               https://bugs.php.net/fix.php?id=81215&r=nozend
MySQL Configuration Error:        https://bugs.php.net/fix.php?id=81215&r=mysqlcfg

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